From Cppreference
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| template< class T >
struct remove_extent;
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| (C++11 feature)
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If T is an array of some type X, provides the member typedef type equal to X, otherwise type is T. Note that if T is a multidimensional array, only the first dimension is removed.
[edit] Member types
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| Name
| Definition
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| type
| the type of the element of T
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[edit] Equivalent definition
template<class T>
struct remove_extent { typedef T type; };
template<class T>
struct remove_extent<T[]> { typedef T type; };
template<class T, std::size_t N>
struct remove_extent<T[N]> { typedef T type;}; |
[edit] Example
#include <iostream>
#include <iterator>
#include <algorithm>
#include <type_traits>
template<typename A>
typename std::enable_if< std::rank<A>::value == 1 >::type
print_1d(const A& a)
{
copy(a, a+std::extent<A>::value,
std::ostream_iterator<typename std::remove_extent<A>::type>(std::cout, " "));
std::cout << '\n';
}
int main()
{
int a[][3] = {{1,2,3},{4,5,6}};
// print_1d(a); // compile-time error
print_1d(a[1]);
}Output:
[edit] See also
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| checks if a type is an array type
(class template)
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| obtains the number of dimensions of an array type
(class template)
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| obtains the size of an array type along a specified dimension
(class template)
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| removes all extents from the given array type
(class template)
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